Spin Fluctuations and Superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Mo</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Sb</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:math>

Candolfi, Christophe; Lenoir, Bertrand; Dauscher, A.; Bellouard, C.; Hejtmánek, J.; Šantavá, E.; Toboła, J.

doi:10.1103/physrevlett.99.037006

Cited by 49 publications

(79 citation statements)

References 35 publications

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“…The occurrence of superconductivity is evidenced by a specific heat jump at 2.2 ±0.05 K. The superconducting phase transition temperature determined from the specific heat measurement is consistent with those obtained from the magnetization and electrical resistivity (not shown here) and with the specific data reported by Candolfi et al [4]. Note, the value of T c observed in the present sample is of about 0.1 K higher than that found in a single crystal of 2.08 K, [1], though specific heat data for single crystal are not yet available.…”

Section: Resultssupporting

confidence: 79%

“…More recently, Candolfi et al [4], have reported magnetic susceptibility, specific heat, and electrical resistivity down to 0.6 K and have interpreted their data within the frameworks of the spin fluctuation theory. Thus, the issue of pairing mechanism becomes debated and the proper superconductivity nature of Mo 3 Sb 7 deserves studies in more details.…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature specific heat of the superconductor Mo3Sb7

2008

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The low-temperature specific heat of a superconductor Mo 3 Sb 7 with T c = 2.25 ±0.05 K has been measured in magnetic fields up to 5 T. In the normal state, the electronic specific heat coefficient γ n , and the Debye temperature Θ D are found to be 34.5(2) mJ/molK 2 and 283(5) K, respectively.The enhanced γ n value is interpreted due to a narrow Mo-4d band pinned at the Fermi level. The electronic specific heat in the superconducting state can be analyzed in terms a phenomenological two BCS-like gap model with the gap widths 2∆ 1 /k B T c = 4.0 and 2∆ 2 /k B T c = 2.5, and relative weights of the mole electronic heat coefficients γ 1 /γ n = 0.7 and γ 2 /γ n = 0.3. Some characteristic thermodynamic parameters for the studied superconductor, like the specific heat jump at T c , ∆C(T c )/γ n T c , the electron-phonon coupling constant, λ e−ph , the upper H c2 and thermodynamic critical H c0 fields, the penetration depth λ, coherence length ξ and the Ginzburg-Landau parameter κ are evaluated. The estimated values of parameters like 2∆ 0 /k B T c , ∆C(T c )/γ n T c , N (E F ), and λ e−ph suggest that Mo 3 Sb 7 belongs to intermediate-coupling regime. The electronic band structure calculations indicate that the density of states near the Fermi level is formed mainly by the Mo-4d orbitals and there is no overlapping between the Mo-4d and Sb-sp orbitals.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Low-temperature specific heat of the superconductor Mo3Sb7

2008

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“…[7,8] As far as the superconducting pairing mechanism is concerned, there is no agreement whether Mo 3 Sb 7 is a typical s-wave electron-phonon (BCS) superconductor or some more complex state is realized. Most of the published results [2,3,[9][10][11], including first principles calculations for the cubic phase, [11] support the conventional * email: wiendlocha@fis.agh.edu.pl…”

Section: Introductionmentioning

confidence: 87%

“…However, various values of the electronic specific heat jump at the transition point were reported, [3,9,12] ∆C/γT c = 1.04−1.56 much smaller, or close to the weakcoupling BCS value 1.43. Moreover, the specific heat in the superconducting state [9,10] and the magnetic field penetration depth [13,14] behaviors were differently analyzed, in terms of either one-or two-gap BCS models.…”

Section: Figmentioning

confidence: 99%

“…Mo 3 Sb 7 is a system, where superconducting, structural and magnetic properties interpenetrate each other. The considerable interest on Mo 3 Sb 7 started, when Candolfi et al, [3] suggested that spin fluctuations compete with superconductivity in this compound, modifying also the temperature dependence of electrical resistivity and magnetic susceptibility. Later on, Tran et al [4] observed a peak in the specific heat C P (T ) at T * = 50 K and reanalyzed anomalies in magnetization and resistivity, arguing the formation of the spin-singlet dimers and opening of the gap [4,5] in spin excitations around T * = 50 K. Next, Koyama et al [6] observed a structural cubic-to-tetragonal distortion below T * = 53 K, and suggested the formation of the spin-singlet dimers valence-bond crystal.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Wiendlocha

Sternik

2014

Intermetallics

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Effect of tetragonal distortion on the electronic structure, dynamical properties and superconductivity in Mo3Sb7 is analyzed using first principles electronic structure and phonon calculations. Rigid muffin tin approximation (RMTA) and McMillan formulas are used to calculate the electron-phonon coupling constant λ and superconducting critical temperature. Our results show, that tetragonal distortion has small, but beneficial effect on superconductivity, slightly increasing λ, and the conclusion that the electron-phonon mechanism is responsible for the superconductivity in Mo3Sb7 is supported. The spin-polarized calculations for the ordered (ferromagnetic or antiferromagnetic), as well as disordered (disordered local moment) magnetic states yielded non-magnetic ground state. We point out that due to its experimentally observed magnetic properties the tetragonal Mo3Sb7 might be treated as noncentrosymmetric superconductor, which could have influence for the pairing symmetry. In this context the relativistic band structure is calculated and spin-orbit interaction effects are discussed.

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Observation of pseudogap in the normal state of superconducting Mo₃Sb₇

Tran

Baťková

Baťko

et al. 2010

Physica Status Solidi (b)

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Using electron tunneling spectroscopy, we investigated density of states of Mo 3 Sb 7 in the temperature range 1.7-60 K. The differential conductance dI/dV vs. V curve at 4.2 K shows that an energy pseudogap of 2D $ 15ð2ÞmeV is formed in the density of states. In the superconducting state, the tunneling spectra exhibit the presence of a BCS-type superconducting gap of D sc ð0Þ $ 0:24meV. Future investigations of the interplay between superconductivity and possible SDW ordering, and the anisotropic nature of the nesting of the Fermi surface in Mo 3 Sb 7 are highly desired.Tunneling spectra of Mo 3 Sb 7 measured in the normal state (a) and in the superconducting state (b).

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Spin Fluctuations and Superconductivity inMo3Sb7

Cited by 49 publications

References 35 publications

Low-temperature specific heat of the superconductor Mo3Sb7

Low-temperature specific heat of the superconductor Mo3Sb7

Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Observation of pseudogap in the normal state of superconducting Mo₃Sb₇

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Spin Fluctuations and Superconductivity inMo3Sb7

Cited by 49 publications

References 35 publications

Low-temperature specific heat of the superconductor Mo3Sb7

Low-temperature specific heat of the superconductor Mo3Sb7

Effect of the tetragonal distortion on the electronic structure, phonons and superconductivity in the Mo3Sb7 superconductor

Observation of pseudogap in the normal state of superconducting Mo3Sb7

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Observation of pseudogap in the normal state of superconducting Mo₃Sb₇